Craters

The 25-million-year-old cavities have perplexed people for decades.

The shattered remnants of a meteor that struck Santa Fe more than a billion years ago.

An ancient impact crater on the outskirts of Pretoria.

A spectacular impact crater in the rugged heart of Central Australia.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

A dark tunnel leads to a striking white crater that seems to be from another planet.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

The giant Siberian crater known locally as the "doorway to the underworld" is expanding every year.

The platform atop this verdant volcano was built with the help of a royal elephant.

A winding, blood-red tunnel of hardened lava navigable by foot.

The site of one of the largest non-nuclear explosions in history, created when a massive bomb dump accidentally exploded.

This natural crater along the coast of Jersey may take its name from the devil statues who have watched over it.

Legend has it thieves once stashed their treasures in this crater in the Mexican desert.